dispatch: make request accept additional reposetups

chg needs special logic around repo object creation (like, collecting and
reporting repo path to the master server). Adding "reposetup" to
dispatch.request seems to be an easy and reasonably clean way to allow that.

mercurial/dispatch.py

@@ -47,7 +47,7 b' from . import ('
 
 class request(object):
     def __init__(self, args, ui=None, repo=None, fin=None, fout=None,
-                 ferr=None):
+                 ferr=None, prereposetups=None):
         self.args = args
         self.ui = ui
         self.repo = repo
@@ -57,6 +57,10 b' class request(object):'
         self.fout = fout
         self.ferr = ferr
 
+        # reposetups which run before extensions, useful for chg to pre-fill
+        # low-level repo state (for example, changelog) before extensions.
+        self.prereposetups = prereposetups or []
+
     def _runexithandlers(self):
         exc = None
         handlers = self.ui._exithandlers
@@ -875,7 +879,8 b' def _dispatch(req):'
                 repo.ui.ferr = ui.ferr
             else:
                 try:
-                    repo = hg.repository(ui, path=path)
+                    repo = hg.repository(ui, path=path,
+                                         presetupfuncs=req.prereposetups)
                     if not repo.local():
                         raise error.Abort(_("repository '%s' is not local")
                                           % path)

mercurial/hg.py

@@ -148,10 +148,12 b' def openpath(ui, path):'
 # a list of (ui, repo) functions called for wire peer initialization
 wirepeersetupfuncs = []
 
-def _peerorrepo(ui, path, create=False):
+def _peerorrepo(ui, path, create=False, presetupfuncs=None):
     """return a repository object for the specified path"""
     obj = _peerlookup(path).instance(ui, path, create)
     ui = getattr(obj, "ui", ui)
+    for f in presetupfuncs or []:
+        f(ui, obj)
     for name, module in extensions.extensions(ui):
         hook = getattr(module, 'reposetup', None)
         if hook:
@@ -161,9 +163,9 b' def _peerorrepo(ui, path, create=False):'
             f(ui, obj)
     return obj
 
-def repository(ui, path='', create=False):
+def repository(ui, path='', create=False, presetupfuncs=None):
     """return a repository object for the specified path"""
-    peer = _peerorrepo(ui, path, create)
+    peer = _peerorrepo(ui, path, create, presetupfuncs=presetupfuncs)
     repo = peer.local()
     if not repo:
         raise error.Abort(_("repository '%s' is not local") %